Someone heats something up and the video call freezes, or the tablet in the kitchen drops off. This is not a coincidence and it is not a faulty microwave. Microwave ovens operate at almost exactly the same frequency as 2.4 GHz Wi-Fi, and even a well-sealed one leaks enough to disrupt a network a few metres away.
The short answer
Move the affected devices to 5 GHz, which is a completely different frequency and unaffected. If they cannot use 5 GHz, change your 2.4 GHz channel to one at the far end of the band, since microwaves concentrate their leakage near the middle. Moving the router away from the kitchen helps too and costs nothing.
Why it happens
A microwave oven cooks at around 2.45 GHz. The 2.4 GHz Wi-Fi band runs from roughly 2.4 to 2.5 GHz. They overlap almost exactly, and an oven runs at hundreds of watts while a router transmits at a fraction of one watt. Even a tiny leak from the door seal or the mesh is enormous by comparison.
Shielding is required and it is generally good, but it is not perfect, and it degrades with age as door seals wear and hinges loosen. An older oven leaks more than a new one, which is why this problem often appears years after both the oven and the router were installed.
Confirm it is the microwave
Run a continuous ping or a speed test while someone starts the oven. If the connection degrades within a second of it starting and recovers when it stops, you have confirmed it rather than assumed it.
Move affected devices to 5 GHz
This is the complete fix. 5 GHz is a different frequency entirely and a microwave does not touch it. If your router broadcasts both bands under one name, split them and connect kitchen and nearby devices to the 5 GHz network explicitly.
Change your 2.4 GHz channel
For devices that cannot use 5 GHz, move to channel 1 or channel 11 rather than the middle of the band. Microwave leakage is concentrated near 2.45 GHz, which sits around channels 8 to 10. The ends of the band are noticeably less affected.
Move the router away from the kitchen
Distance helps quickly, since the leakage falls off sharply. Moving a router from the kitchen worktop to a hallway shelf often resolves it entirely, and usually improves coverage elsewhere too.
Check the oven door seal
Look for damage, food residue around the seal, a door that does not close squarely, or visible damage to the mesh in the window. All of these increase leakage. A door that has been slammed for years is the usual culprit.
Move smart home devices out of the kitchen radius
Smart plugs, speakers and sensors are usually 2.4 GHz only and cannot move to 5 GHz. Relocating them, or adding coverage from a different direction, is the practical answer.
Use ethernet for anything fixed in the kitchen
A television or a smart display on a cable is immune. If there is a socket, this is the most reliable fix available.
Add a mesh node or access point on the far side
If the kitchen sits between the router and the rooms that lose connection, the signal is passing through the interference zone. A second access point that reaches those rooms by another route avoids it entirely.
A microwave that interferes noticeably from several metres away, or that has a visibly damaged door seal or window mesh, is worth having checked. Leakage is regulated for good reason, and a substantial leak is a safety matter rather than just a networking nuisance.
Other things in the same band
Microwaves are the most dramatic but they are not alone. The 2.4 GHz band is shared with a long list of household devices:
- Cordless phones, particularly older models.
- Baby monitors, which transmit continuously rather than in bursts.
- Bluetooth devices, which hop across the band constantly.
- Wireless security cameras on the same band.
- USB 3 devices and cables, which emit interference at close range.
- Some lighting controls and garage door openers.
If your 2.4 GHz network is unreliable generally rather than only during cooking, a Wi-Fi analyser app will show you how crowded the band is and which channels are least used.
Channels 1, 6 and 11 are the only three that do not overlap each other on 2.4 GHz. Anything in between overlaps two of them and makes things worse for everyone. If you are choosing a channel, pick whichever of those three is least used by your neighbours, and prefer 1 or 11 if microwave interference is your specific problem.
The long-term answer
The 2.4 GHz band is genuinely crowded and will not get better. The practical response is to use it only for devices that need its range and cannot do anything else, which mostly means smart home hardware, and to put everything capable of 5 GHz onto 5 GHz.
That split does two things at once: it removes your laptops, phones and televisions from the interference entirely, and it frees up 2.4 GHz airtime for the devices that have no choice. It is the single most useful change most households can make to their Wi-Fi.
Can a microwave really break my Wi-Fi?
Yes. It operates at almost the same frequency and at hundreds of watts, so even a small leak overwhelms a router transmitting at a fraction of a watt.
Does this affect 5 GHz Wi-Fi?
No. 5 GHz is a different frequency entirely and microwaves do not touch it. Moving devices to 5 GHz is the complete fix where it is possible.
Which 2.4 GHz channel is best against microwave interference?
Channel 1 or channel 11. Microwave leakage concentrates near the middle of the band, so the ends are noticeably less affected.
Does an older microwave leak more?
Generally yes. Door seals wear, hinges loosen and mesh can be damaged. If the interference has got worse over time, that is why.
What else uses the same band?
Cordless phones, baby monitors, Bluetooth, some cameras and USB 3 devices. If 2.4 GHz is unreliable generally, a Wi-Fi analyser will show you how crowded it is.
The bottom line
Move everything that can use 5 GHz onto 5 GHz, because that removes the problem entirely rather than reducing it. For devices stuck on 2.4 GHz, use channel 1 or 11 and move the router away from the kitchen. And if the oven interferes from several metres away or its door seal looks damaged, have it checked for reasons beyond your Wi-Fi.
